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Enable multilevel table of contents

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This commit is contained in:
Martin Kremers 2014-12-14 15:07:25 +01:00
parent d9fe01d8f6
commit 714f5c838d
1 changed files with 15 additions and 5 deletions
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20
src/cryogen_core/toc.clj
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@ -2,10 +2,13 @@
(:require [crouton.html :as html]
[hiccup.core :as hiccup]))
(def _h [:h1 :h2 :h3 :h4 :h5 :h6])
(defn- compare_index [i1 i2] (- (.indexOf _h i2) (.indexOf _h i1)))
(defn get-headings [content]
(reduce
(fn [headings {:keys [tag attrs content] :as elm}]
(if (some #{tag} [:h1 :h2 :h3])
(if (some #{tag} _h)
(conj headings elm)
(if-let [more-headings (get-headings content)]
(into headings more-headings)
@ -13,9 +16,16 @@
[] content))
(defn make-links [headings]
(into [:ol.contents]
(for [{[{{name :name} :attrs} title] :content} headings]
[:li [:a {:href (str "#" name)} title]])))
(loop [items headings acc nil _last nil]
(if-let [{tag :tag [{{name :name} :attrs} title] :content} (first items)]
(if (nil? name) (recur (rest items) acc nil)
(let [entry [:li [:a {:href (str "#" name)} title]]
jump (compare_index _last tag)]
(cond (> jump 0) (recur (rest items) (str acc "<ol>" (hiccup/html entry)) tag)
(= jump 0) (recur (rest items) (str acc (hiccup/html entry)) tag)
(< jump 0) (recur (rest items) (str acc (apply str (repeat (* -1 jump) "</ol>"))
(hiccup/html entry)) tag))))
(str acc "</ol>"))))
(defn generate-toc [html]
(-> html
@ -25,4 +35,4 @@
:content
(get-headings)
(make-links)
(hiccup/html)))
(clojure.string/replace-first #"ol" "ol class=\"contents\"")))